ho risolto così

codice:
if (objCode<% = strNomeInput %>.value!='') {
	top.nomeiframe<% = strNomeInput %>.location='RelatedTopicUtility.asp?InputType=Code&InputTypeParameter=' + strCode + '&InputName=7&onlyReleasedTopics=5&IdExcludedTopic=3';
	objCode.value='';
};